问题
I have seen mixed examples of Microservices implemented as worker roles processing requests off a queue and/or as APIs (REST).
Supporting asynchronous scenarios, a queue can be utilized, with a simple dumb queue listener forwarding the request to a Microservice REST API, where as synchronous scenarios would call the REST API directly.
The term Microservice is vaguely defined I think; do people consider them APIs (e.g. RESTful services) or as any abstract service processing requests, however that request was provided ?
回答1:
Your microservices can be a small application that exposes a few RESTful endpoints, or it can be a background worker that reaps a queue. It can even be an AWS Lambda function that's invoked on some event.
The point is that your application is composed of several smaller applications, thus allowing you a greater amount of agility when it comes to deploying code, programming languages, frameworks, etc.
来源：https://stackoverflow.com/questions/33291874/microservices-worker-roles-apis-or-both